Toymods Car Club Inc: Tech & Conversions => fuel pump stops when hot (again)

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ChrisTH
Occasional Poster

Location:
Thailand
Registered:
September 2005

Re: fuel pump stops when hot (again)	Fri, 07 October 2005 04:50

EVOSTi I was not hinting at the VL pumps being fed dirty fuel, more like the lift pump delivering insufficient flow of fuel due to dirt at its suction point. A lift pump is normally a high flow/low pressure device (think about a propeller pump in a fish tank). It has a max flow rating (based on rotation speed and propeller size), but the inlet and outlet size (and piping) sets the limits of the flow rate. Any obstruction in inlet/outlet will not affect the pump very much (in worst case it will just move the same liquid around in the propeller housing) but the flow rate will be seriously affected. A high-pressure pump will normally deliver a constant flow. That flow is independent of pressure or obstructions. Pumps like that, e.g., geartype or piston pumps, will basically run or blow up, unless there is a safety feature (internal feedback or cutout). I do agree that you probably have a temperature problem. But that could be cause by the bad flow to the surge tank. Then the fuel being circulated there will be the fuel from the fuel rail. That could cause your pump to cut out due to overheating. I would check the flow from the lift pump. There should be sufficient flow to flush the return fuel back into the main tank. I noticed that you were thinking about a new (and bigger) lift pump, so we think in the same way. Returning the fuel from the rail directly to the main tank might be a bad idea. It might solve the heat problem, but if the inflow to the surge tank is too low, you might end up draining the surge tank. What you could also consider is to look at the piping from the main tank, over the lift pump, and to the surge tank. By using bigger pipes/hoses you might get sufficient flow from your existing lift pump. If you do check the fuel pipes then you should probably also take a short look at the mesh filter in your main tank: "If your sprinter has an australian fuyel tank, then it has basically nothing in the way of cup/bucket swirl pot, just one diagonalish baffle and a little mesh filter on the end of the fuel pickup." [Report message to a moderator]

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